convert Contour queryboxes to .ui

Change-Id: Ie6dad2409a7d58a1c01973e8740f436cb597cb99
Reviewed-on: https://gerrit.libreoffice.org/6923
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>